This is the last help i need so plz help

The manufacturer of a new product developed the following expression to predict the monthly profit, in thousands of dollars, from sales of the productwhen it is sold at a unit price of x dollars.-0.5x^2 + 22x - 224what is represented by the zero(s) of the expression? a.the profit when the unit price is equal to 0b.the unit price(s) when the profit is equal to 0c.the profit when the unit price is greatestd.the unit price(s) when profit is greatest

Need 50 will mark brainliest answer. find the lengths of all the sides and the measures of the angles.

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m